1/*
2 * Sunplus JPEG decoder (SP5X)
3 * Copyright (c) 2003 Alex Beregszaszi
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * Sunplus JPEG decoder (SP5X).
25 */
26
27#include "avcodec.h"
28#include "mjpeg.h"
29#include "mjpegdec.h"
30#include "sp5x.h"
31
32
33static int sp5x_decode_frame(AVCodecContext *avctx,
34                              void *data, int *data_size,
35                              AVPacket *avpkt)
36{
37    const uint8_t *buf = avpkt->data;
38    int buf_size = avpkt->size;
39    AVPacket avpkt_recoded;
40#if 0
41    MJpegDecodeContext *s = avctx->priv_data;
42#endif
43    const int qscale = 5;
44    const uint8_t *buf_ptr;
45    uint8_t *recoded;
46    int i = 0, j = 0;
47
48    if (!avctx->width || !avctx->height)
49        return -1;
50
51    buf_ptr = buf;
52
53#if 1
54    recoded = av_mallocz(buf_size + 1024);
55    if (!recoded)
56        return -1;
57
58    /* SOI */
59    recoded[j++] = 0xFF;
60    recoded[j++] = 0xD8;
61
62    memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
63    memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
64    memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
65    j += sizeof(sp5x_data_dqt);
66
67    memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
68    j += sizeof(sp5x_data_dht);
69
70    memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
71    AV_WB16(recoded+j+5, avctx->coded_height);
72    AV_WB16(recoded+j+7, avctx->coded_width);
73    j += sizeof(sp5x_data_sof);
74
75    memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
76    j += sizeof(sp5x_data_sos);
77
78    if(avctx->codec_id==CODEC_ID_AMV)
79        for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
80            recoded[j++] = buf[i];
81    else
82    for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
83    {
84        recoded[j++] = buf[i];
85        if (buf[i] == 0xff)
86            recoded[j++] = 0;
87    }
88
89    /* EOI */
90    recoded[j++] = 0xFF;
91    recoded[j++] = 0xD9;
92
93    avctx->flags &= ~CODEC_FLAG_EMU_EDGE;
94    av_init_packet(&avpkt_recoded);
95    avpkt_recoded.data = recoded;
96    avpkt_recoded.size = j;
97    i = ff_mjpeg_decode_frame(avctx, data, data_size, &avpkt_recoded);
98
99    av_free(recoded);
100
101#else
102    /* SOF */
103    s->bits = 8;
104    s->width  = avctx->coded_width;
105    s->height = avctx->coded_height;
106    s->nb_components = 3;
107    s->component_id[0] = 0;
108    s->h_count[0] = 2;
109    s->v_count[0] = 2;
110    s->quant_index[0] = 0;
111    s->component_id[1] = 1;
112    s->h_count[1] = 1;
113    s->v_count[1] = 1;
114    s->quant_index[1] = 1;
115    s->component_id[2] = 2;
116    s->h_count[2] = 1;
117    s->v_count[2] = 1;
118    s->quant_index[2] = 1;
119    s->h_max = 2;
120    s->v_max = 2;
121
122    s->qscale_table = av_mallocz((s->width+15)/16);
123    avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
124    s->interlaced = 0;
125
126    s->picture.reference = 0;
127    if (avctx->get_buffer(avctx, &s->picture) < 0)
128    {
129        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
130        return -1;
131    }
132
133    s->picture.pict_type = FF_I_TYPE;
134    s->picture.key_frame = 1;
135
136    for (i = 0; i < 3; i++)
137        s->linesize[i] = s->picture.linesize[i] << s->interlaced;
138
139    /* DQT */
140    for (i = 0; i < 64; i++)
141    {
142        j = s->scantable.permutated[i];
143        s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
144    }
145    s->qscale[0] = FFMAX(
146        s->quant_matrixes[0][s->scantable.permutated[1]],
147        s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
148
149    for (i = 0; i < 64; i++)
150    {
151        j = s->scantable.permutated[i];
152        s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
153    }
154    s->qscale[1] = FFMAX(
155        s->quant_matrixes[1][s->scantable.permutated[1]],
156        s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
157
158    /* DHT */
159
160    /* SOS */
161    s->comp_index[0] = 0;
162    s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
163    s->h_scount[0] = s->h_count[0];
164    s->v_scount[0] = s->v_count[0];
165    s->dc_index[0] = 0;
166    s->ac_index[0] = 0;
167
168    s->comp_index[1] = 1;
169    s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
170    s->h_scount[1] = s->h_count[1];
171    s->v_scount[1] = s->v_count[1];
172    s->dc_index[1] = 1;
173    s->ac_index[1] = 1;
174
175    s->comp_index[2] = 2;
176    s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
177    s->h_scount[2] = s->h_count[2];
178    s->v_scount[2] = s->v_count[2];
179    s->dc_index[2] = 1;
180    s->ac_index[2] = 1;
181
182    for (i = 0; i < 3; i++)
183        s->last_dc[i] = 1024;
184
185    s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
186    s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
187
188    init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
189
190    return mjpeg_decode_scan(s);
191#endif
192
193    return i;
194}
195
196AVCodec sp5x_decoder = {
197    "sp5x",
198    AVMEDIA_TYPE_VIDEO,
199    CODEC_ID_SP5X,
200    sizeof(MJpegDecodeContext),
201    ff_mjpeg_decode_init,
202    NULL,
203    ff_mjpeg_decode_end,
204    sp5x_decode_frame,
205    CODEC_CAP_DR1,
206    NULL,
207    .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
208};
209
210AVCodec amv_decoder = {
211    "amv",
212    AVMEDIA_TYPE_VIDEO,
213    CODEC_ID_AMV,
214    sizeof(MJpegDecodeContext),
215    ff_mjpeg_decode_init,
216    NULL,
217    ff_mjpeg_decode_end,
218    sp5x_decode_frame,
219    CODEC_CAP_DR1,
220    .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
221};
222